(comment from inherited method)this message is sent by the runtime system (VM) when
a message is not understood by some object (i.e. there
is no method for that selector). The original message has
been packed into aMessage (i.e. the receiver, selector and
any arguments) and the original receiver is then sent the
#doesNotUnderstand: message.
Here, we raise another signal which usually enters the debugger.
You can of course redefine #doesNotUnderstand: in your classes
to implement message delegation,
or handle the MessageNotUnderstood exception gracefully.

invoked when some HTML-element (such as a button) with an ONCLICK
action is pressed. This is supposed to parse the passed string as
an expression in my language (i.e. javaScript) and invoke that
function.